Dorrough 10-A Analog Loudness Meter + 14dB

Dorrough 10-A Analog Loudness Meter + 14dB

Dorrough 10-A Analog Loudness Meter + 14dB

B&H # DO10A MFR # 10-A
Dorrough 10-A Analog Loudness Meter + 14dB

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  • 1Description

The 10-A Analog Loudness Meter +14dB is a smaller single channel version of Dorrough's standard 40-A loudness monitor, with Phoenix (euroblock) connectors. This meter requires rack mounting and has an external power supply.

Actual Energy Display
Dorrough Loudness Meters display actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. This feature allows all program material to be adjusted for equal perceived loudness while protecting the peak of the waveform.
Peak and Average Level Metering
The 10-A, like all Dorrough loudness meters, simultaneously displays peak and average. The relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale.
Stereo Mixing
With one instrument, the operator can easily see the stereo mix and avoid classic in-phase/out-of-phase problems as well as center channel buildup causing a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
In the Box
Dorrough 10-A Analog Loudness Meter + 14dB
  • External Power Supply
  • 2-Year Warranty
  • Table of Contents
    • 1Description
    Input Impedance 20k Ohm balanced, 10k Ohm single-ended, ±2%
    Common Mode Rejection Ratio 80dB at 60Hz, 60dB at 20KHz (balanced mode)
    Input Sensitivity -10dB for full-scale display
    Maximum Input Level +24dB before clipping
    Signal Path Bandwidth 10Hz - 25KHz, ± .25dB
    Signal Path Distortion Less than 1% THD at 1KHz, +24dB input
    Sum Error Less than 0.1dB at 1KHz
    Difference Error Less than 0.1dB at 1KHz
    Display Resolution Less than 0.1dB at 1KHz
    Step Size Error ± 0.25dB
    Absolute Error Full Scale -39dBu: ± 0.25dB model A,B,C
    Drift ± 0.25dB
    Average Time Constant 600mS, ± 6%
    Peak Acquisition Period 10uS, to full-scale, sine input 25KHz
    Peak Attack Period Virtually instantaneous
    Peak Decay Period 180mS, from full-scale to all LEDs off (models A, B, C)
    Display Update Rate Approximately 10mS
    Display Duty Cycle Display Time, AVERAGE, PEAK HOLD - 75%

    Display Time, PEAK - 100%

    Power Supply Input Range 117/237VAC RMS, -20% to +10%, 50-60Hz
    Calibration Controls None Needed
    User Controls Left/Right input sensitivity Option DIP Switch

    A) Peak Auto [ON]

    B) Difference Mode [ON/OFF]

    C) Over Level Alarm [ENABLE]

    D) Under Level Alarm [ENABLE]

    E) Auto ARMP

    User Port DB-9 Connector A) Alarm relay closure contacts 1 form C, 1A, 30V AC or DC

     B) Mode control switch (user supplied)

    C) PEAK function switch (user supplied)

    Dimensions (WxDxH) 4.25 x 3.0 x 2.0" (1.7 x 1.2 x 0.8cm)
    Weight Not specified by the manufacturer
    Packaging Info
    Package Weight 1.6 lb
    Box Dimensions (LxWxH) 7.9 x 6.2 x 2.0"

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